This article describes how to delete an iteration in a project. 

Prerequisites

• You must have "Change" access rights to the CMS project OR the Administrator role in the server.
• The use of Iterations is activated for the project.
• The iteration does not contain any issues.
• Iterations are included in the view definition.

If the iteration that you want to delete is closed, you will need to first click on Show closed iterations to include the display of closed iterations.

Then, select the iteration to be deleted. The iteration Properties will display in the right-side pane. 

To delete the empty iteration, click Delete.

If the Delete option is grayed out, the iteration either contains issuesor you do not have "Change" rights to the project. In the below example, there are 4 issues in the "Backlog" iteration. Those will need to be unassigned from the iteration before it can be deleted.